Bug 2466737 (CVE-2026-30246)

Summary: CVE-2026-30246 github.com/gofiber/fiber/v3: github.com/gofiber/fiber/v3: Information disclosure due to incorrect cache key generation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in github.com/gofiber/fiber/v3. The default key generator in the cache middleware incorrectly uses only the request path, omitting the query string. This allows requests for the same path but with different query parameters to share a cache key, leading to incorrect cached responses. A remote attacker could exploit this to cause response mix-up for query-dependent endpoints, potentially exposing sensitive data intended for other requests.
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Bug Depends On: 2484673    
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Description OSIDB Bzimport 2026-05-05 13:01:37 UTC 
Fiber is a web framework for Go. In github.com/gofiber/fiber/v3 versions through 3.1.0, the default key generator in the cache middleware uses only the request path and does not include the query string. As a result, requests for the same path with different query parameters can share a cache key and receive the wrong cached response. This can cause response mix-up for query-dependent endpoints and may expose data intended for a different request. This issue is fixed after version 3.1.0.